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This paper discusses the effect of temperature on polarization and depolarization current measurements on paper oil insulation system. The influence of copper sulphide formed due to corrosive sulphur in mineral oil, on the changes in polarization and depolarization current at different temperatures are considered. A significant increase in the magnitude of polarization and depolarization currents...
This paper presents results of Frequency Domain Spectroscopy (FDS) and Polarization/Depolarization current (PDC) for understanding the combined effects of copper corrosion and moisture content in paper oil insulation of transformers. This method is not fully exploited and documented for applications to field studies. Hence an attempt is made to understand the effects of copper corrosion and moisture...
This paper discusses the importance of chemical analysis of transformer oil in understanding the phenomena of copper corrosion in transformers. Parameters like total sulphur, mercaptan sulphur, DBDS concentration and detection of loss of metal passivators due to thermal ageing are discussed with reference to formation and migration of copper sulphide. These evaluations provide useful information about...
This paper discusses the chemical and dielectric methods of analysis of aging of paper oil insulation due to copper corrosion which occurs in presence of reactive and corrosive sulphur in transformer oil. Results of Chemical Analysis and dielectric measurements are presented and discussed for understanding the usefulness of these methods in arriving at a comprehensive method to explain the effects...
The role of Mercaptans in causing copper corrosion is investigated and discussed in this paper. The performance of transformer oil samples has been investigated by conventional accelerated thermal-electrical ageing of paper oil insulation. Discharge measurements have been carried out using PD technique and variation of statistical parameters of discharges due to deposits of copper sulphide in between...
Performance of Power and Converter transformers has been severely affected by the presence of reactive and corrosive sulphur in transformer oil. It is reported that mitigation of the problem of corrosion of copper conductors due to presence of reactive/corrosive sulphur in transformer oil is possible by the use of metal passivator which forms a thin film on copper surface to prevent interaction of...
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